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Optimized thermal connection to the earth is the single most
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Optimizing the thermal connection of a closed loop to the earth is the single most important factor affecting heat pump performance. At Thermonexus, we focus on one thing; the Earth.
Drilling industry experience and expertise matters. Few drillers and even fewer HVAC contractors have the knowledge of the subsurface that our team has. Our multi-disciplinary team of geologists, thermodynamic engineers, and material scientists work with HVAC installers, architects/engineers and drillers to define ground conditions and utilize advanced ground heat exchangers to achieve optimum design and installation.
Why is the earth connection so important?
The efficiency of a Ground Source Heat Pump is driven by two important variables:
- Entering water temperature (EWT)
- Quantity of water flowing across the heat pump coil.
- Climate control needs
- Ground properties
- Borehole resistance
The first two parameters remain fixed regardless of the design of the ground heat exchanger (GHEX) field. However, borehole resistance is directly related to the design of the borehole and the type of materials used. Not all GHEX materials are alike in terms of thermal performance.
A conventional U-tube is constructed of HDPE (plastic) which is encased in a clay-sand grout. Both are poor conductors of heat and, therefore, provide a poor means of exchanging heat between the water and the earth.
HPGX™ technology incorporates advanced materials and a flow design geared to maximizing heat transfer. HPGX™ results in lower borehole resistance, more heat transfer per foot, and less boreholes needed to transfer an equivalent amount of thermal energy.
Why is this important?
Typical U-tube ground heat exchanger (GHEX) fields require significant square footage on a property. This works in rural areas where space is not an issue, but prohibits the deployment of GeoEnergy systems in metropolitan areas where real estate is at a premium, but where climate control demands are the highest.